Reacción #59543

Ecuación de reacción

5-nitro-2-(2-phenylchroman-6-yloxy)pyridine

2-(3-fluorophenyl)chroman-4,6-diol

→

2-(3-Fluorophenyl)-6-(5-nitropyridin-2-yloxy)chroman-4-ol

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroThe product was purified by column chromatography
2. 2
   Lavadoelution with ethyl acetate-heptane (20%→33%)
3. 3
   Otrocrystallised from a mixture of 2-propanol and acetone

Procedimiento

2-(3-Fluorophenyl)-6-(5-nitropyridin-2-yloxy)chroman-4-ol was prepared as described for 5-nitro-2-(2-phenylchroman-6-yloxy)pyridine in Example 1(b) starting from 890 mg of 2-(3-fluorophenyl)chroman-4,6-diol (Example 9(b)). The product was purified by column chromatography using gradient elution with ethyl acetate-heptane (20%→33%) and then crystallised from a mixture of 2-propanol and acetone. 1H NMR (400 MHz, d6-DMSO) δ: 9.04 (d, 1H, J 2.9 Hz), 8.61 (dd, 1H, J 9.1, 2.9 Hz), 7.48 (m, 1H), 7.35-7.31 (m, 2H), 7.26-7.19 (m, 3H), 7.02 (dd, 1H, J 8.8, 2.9 Hz), 6.91 (d, 1H, J 8.8 Hz), 5.67 (d, 1H, J 6.4 Hz), 5.34 (d, 1H, J 10.4 Hz), 4.98 (m, 1H), 2.36 (m, 1H), 1.99 (m, 1H).

Fuente